CoxPy porous nanometer sheet, and synthesis method and application thereof

A synthesis method and nanosheet technology, applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of poor stability, high cost, low selectivity, etc., and achieve mild conditions, short reaction time, and reproducibility. Good results

Active Publication Date: 2017-05-17
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, those OER catalysts based on noble metals not only have high cost, low selectivity, but also poor stability.

Method used

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  • CoxPy porous nanometer sheet, and synthesis method and application thereof
  • CoxPy porous nanometer sheet, and synthesis method and application thereof
  • CoxPy porous nanometer sheet, and synthesis method and application thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Co x P y (x=1; y=1) Synthesis of Porous Nanosheets and Their Electrocatalytic Hydrogen and Oxygen Evolution Properties

[0031] The specific synthesis process is as follows: at room temperature, in a clean and dry 250mL three-necked flask, add 5mol cobalt nitrate, 0.25-1.25g sodium dodecylsulfonate, 25mL deionized water and 25mL butanol, mix well, and then Add 3.0g of urea to the mixed solution to obtain the mixed solution A; then transfer the mixed solution A to a stainless steel reaction kettle with a polytetrafluoroethylene liner, react at 110°C for a period of time, and naturally cool to room temperature to obtain the product I, vacuum-dried at room temperature for 4 hours for analysis and characterization; the product I was then annealed, and in an oxygen-rich atmosphere, the temperature was raised to 250°C at a rate of 1-10°C / min, and then naturally cooled to At room temperature, product II is obtained (product II is an oxide of cobalt); then, in a mi...

Embodiment 2

[0038] Example 2: Co x P y (x=2; y=1) Synthesis of Porous Nanosheets and Their Electrocatalytic Hydrogen and Oxygen Evolution Performance

[0039] The specific synthesis process is as follows: at room temperature, in a clean and dry 250mL three-necked flask, add 5mol cobalt nitrate, 0.25-1.5g sodium dodecylsulfonate, 40mL deionized water and 40mL hexanol, mix well, and then Add 3.0g of urea to the mixed solution to obtain the mixed solution A; then transfer the mixed solution A to a stainless steel reaction kettle with a polytetrafluoroethylene liner, react at 110°C for a period of time, and naturally cool to room temperature to obtain the product I, vacuum-dried at room temperature for 4 hours for analysis and characterization; the product I was then annealed, and in an oxygen-enriched atmosphere, the temperature was raised to 350°C at a rate of 1-10°C / min, and then naturally cooled to At room temperature, product II was obtained; then, in a mixed solvent system (1-20 mL oc...

Embodiment 3

[0044] Example 3: Co x P y (x=1; y=3) Synthesis of Porous Nanosheets and Their Electrocatalytic Hydrogen and Oxygen Evolution Performance

[0045] The specific synthesis process is as follows: at room temperature, in a clean and dry 250mL three-necked flask, add 5mol cobalt acetate, 0.25-1.5g sodium stearate, 35mL deionized water and 40mL butanol, mix well, and then pour into the mixed solution Add 3.0g of urea to obtain mixed solution A; then transfer mixed solution A to a stainless steel reactor with a polytetrafluoroethylene liner, react at 110°C for a period of time, and then cool naturally to room temperature to obtain product I. Dry under vacuum for 4 hours for analysis and characterization; the product I is then annealed, and in an oxygen-enriched atmosphere, the temperature is raised to 450°C at a rate of 1-10°C / min, and then naturally cooled to room temperature to obtain the product II; then, in the mixed solvent system (1-20mL octadecene+1-10mL oleic acid), add 0.0...

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Abstract

The invention discloses a CoxPy (x more than 0 but less than or equal to 2 and y more than 0 but less than 4) porous nanometer sheet and a synthesis method for the CoxPy porous nanometer sheet. The method comprises the following steps: adopting a hydrothermal method for synthesizing a hydroxide precursor; annealing the precursor under an oxygen enrichment environment, thereby acquiring a porous cobalt oxide nanometer sheet; and performing phosphating under suitable environment and temperature, thereby acquiring the CoxPy porous nanometer sheet. The invention also discloses an application of the CoxPy porous nanometer sheet at the aspects of electric catalytic hydrogen evolution and electric catalytic oxygen absorption under different medium conditions. According to the synthesis method disclosed by the invention, a solid-liquid phase chemical conversion method is adopted for acquiring the CoxPy porous nanometer sheet. The method has the advantages of simple process, mild condition, short reaction time, excellent reproducibility, operation safety, high yield and suitability for mass production.

Description

technical field [0001] The present invention relates to a Co x P y Porous nanosheets, also involving the aforementioned Co x P y The synthesis method of porous nanosheets and the application of electrocatalytic hydrogen evolution and electrocatalytic oxygen absorption in different media environments. Background technique [0002] In order to efficiently prepare clean fuel H 2 , electrocatalytic water splitting for hydrogen production is considered to be an ideal pathway, but this reaction requires a suitable catalyst to promote the hydrogen evolution reaction (HER). Currently, the best HER electrocatalyst is Pt / C, which lies in the classical H 2 - the vertex of the volcano-type curve, the corresponding Gibbs free energy change ΔG H =0. However, due to the limited reserves of Pt on the earth and its high price, it is urgent to find cheap, efficient, and long-lived non-Pt electrocatalysts to replace Pt-based catalysts for applications in HER and reduce its overpotential...

Claims

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Application Information

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IPC IPC(8): C01B25/08B01J27/185B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B25/08B01J27/1853C01P2004/60C01P2004/04C01P2004/20C01P2002/72B01J35/33B01J35/50B01J35/40
Inventor 韩敏常莹雪包建春许东东
Owner NANJING NORMAL UNIVERSITY
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